Suzuki AN650 2002 Service Manual page 411

Complaint
Engine runs poorly in Defective air flow system
high speed range.
Defective control circuit or sensor
10. Throttle position sensor out of adjustment.
11. Defective fuel tank pressure control valve.
Engine lacks power. Defective engine internal/electrical parts
10. Clogged air cleaner element.
11. Imbalanced throttle valve synchronization.
12. Sucking air from throttle valve or vacuum hose.
13. Too much engine oil.
14. Defective fuel pump or ECM.
15. Defective crankshaft position sensor and ignition coil.
Defective control circuit or sensor
10. Imbalanced throttle valve synchronization.
11. Throttle position sensor out of adjustment.
12. Defective fuel tank pressure control valve.
Symptom and possible causes
1. Clogged air cleaner element.
2. Defective throttle valve.
3. Defective IAC valve.
4. Sucking air from throttle body joint.
5. Imbalanced throttle valve synchronization.
1. Low fuel pressure.
2. Defective throttle position sensor.
3. Defective intake air temp. sensor.
4. Defective camshaft position sensor.
5. Defective crankshaft position sensor.
6. Defective gear position switch.
7. Defective intake air pressure sensor.
8. Defective atmospheric pressure sensor.
9. Defective ECM.
1. Loss of tappet clearance.
2. Weakened valve springs.
3. Valve timing out of adjustment.
4. Worn piston rings or cylinders.
5. Poor seating of valves.
6. Fouled spark plug.
7. Incorrect spark plug.
8. Clogged injector.
9. Throttle position sensor out of adjustment.
1. Low fuel pressure.
2. Defective throttle position sensor.
3. Defective intake air temp. sensor.
4. Defective camshaft position sensor.
5. Defective crankshaft position sensor.
6. Defective gear position switch.
7. Defective intake air pressure sensor.
8. Defective atmospheric pressure sensor.
9. Defective ECM.
SERVICING INFORMATION
Remedy
Clean or replace.
Adjust or replace.
Replace.
Repair or replace.
Adjust.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Adjust.
Replace.
Adjust.
Replace.
Repair.
Clean or replace.
Adjust or replace.
Clean.
Adjust.
Clean.
Adjust.
Retighten or replace.
Drain out excess oil.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Adjust.
Replace.
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